The imitation of natural sounds in various cultures is a diverse phenomenon and can fill in various functions. In several instances, it is related to the belief system (yoiks of the Sami, some other shamanic songs and rituals, overtone singing of some cultures). It may serve also such practical goals as luring in the hunt; or entertainment (katajjaqs of Inuit). Among some peoples of the Altai-Sayan region, including Tofa, the ability to mimic sounds of the environment includes hunting calls, and is present also in a traditional singing tradition preserved only by some old people.